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Implement floored / and divisor-sign % operators (#745)

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Fixes #703
This commit is contained in:
Rangi
2021-02-21 13:14:44 -08:00
committed by GitHub
parent a6d844a9a5
commit 5fd636ac4b
8 changed files with 85 additions and 9 deletions
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20
src/link/patch.c
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@@ -21,6 +21,22 @@
#include "extern/err.h"
static int32_t divide(int32_t dividend, int32_t divisor)
{
// Adjust division to floor toward negative infinity,
// not truncate toward zero
return dividend / divisor - ((dividend % divisor < 0) != (divisor < 0));
}
static int32_t modulo(int32_t dividend, int32_t divisor)
{
int32_t remainder = dividend % divisor;
// Adjust modulo to have the sign of the divisor,
// not the sign of the dividend
return remainder + divisor * ((remainder < 0) != (divisor < 0));
}
static int32_t exponent(int32_t base, uint32_t power)
{
int32_t result = 1;
@@ -235,7 +251,7 @@ static int32_t computeRPNExpr(struct Patch const *patch,
popRPN();
value = INT32_MAX;
} else {
value = popRPN() / value;
value = divide(popRPN(), value);
}
break;
case RPN_MOD:
@@ -247,7 +263,7 @@ static int32_t computeRPNExpr(struct Patch const *patch,
popRPN();
value = 0;
} else {
value = popRPN() % value;
value = modulo(popRPN(), value);
}
break;
case RPN_UNSUB: